CollarDirect Rolled Martingale Dog Collar, Training Genuine Leather Collars for Dogs&nbsp;Small Medium Large Puppy Black Pink Brown White Red Green Blue Orange This is a martingale collars for dogs medium. This size may fit a dog with 20" - 21" neck girth. Collar width is 1/2. Please measure your dogs neck girth with a soft measuring tape to choose correct size. Martingale dog collars made out of specially treated very soft genuine leather. Rolled (Round) collars are particularly well suited for long haired dog breeds. The round shape prevents tangling and damaging dog's fur. Leather dog collars and puppy collars is a perfect combination of style, high quality and comfort. leather dog collars and puppy collars is a perfect combination of style, high quality and comfort. These leather collars for adult dogs as well as puppies are comfortable, pliable, light and elegant. Quality hardware is used to make these genuine leather collars for dogs. Martingale collars for dogs are handmade strong, durable, and have great plane design. Our leather collars for dogs are perfect for daily use. We also offer matching leather dog leashes for our adjustable Leather collars for dogs. Browse our store for other matching products.